Method of driving head mounted display and head mounted display performing the same

ABSTRACT

A method of driving a head mounted display is provided. The method derives a position adjustment data by displaying a binocular position adjustment image on a left-eye panel region and a right-eye panel region, derives a size adjustment data by displaying a binocular size adjustment image on the left-eye panel region and the right-eye panel region, generates a luminance adjustment data based on a difference between a left-eye and a right-eye luminance perception data, converts an image source into an input image data based on the position adjustment data, the size adjustment data, and the luminance adjustment data, and displays an image corresponding to the input image data.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority under 35 U.S.C. § 119 to Korean patentApplication No. 10-2016-0136018 filed on Oct. 19, 2016, the disclosureof which is hereby incorporated by reference herein in its entirety.

BACKGROUND 1. Technical Field

Example embodiments of the inventive concept relate to display devices.More particularly, example embodiments of the inventive concept relateto a method of driving head mounted display and a head mounted displayperforming the method.

2. Description of the Related Art

A head mounted display may be mounted on a user's head, may enlarge animage (e.g., an image displayed on a display panel) using a lens, andmay provide the image directly to eyes of the user.

Generally, when a pixel density of a display panel is greater than 500pixels per inch (PPI), the user may not recognize pixels in the normaldisplay panel. However, the user could recognize pixels in the displaypanel of the head mounted display because the head mounted displayprovide magnified images to the user using the lens. The head mounteddisplay may perform a variety of image processing methods for improvinga display quality such as a rendering process in the boundary of theobject in the image, etc.

However, since the head mounted display does not consider the differencein the visual perceptions of the user's left-eye and right-eye(hereinafter, referred to as “binocular disparity”) in the imageprocessing process, the perceived fatigue of the user is increased andthe nausea (or motion sickness) caused by sensory conflict of thebinocular vision can be felt. If the user has a binocular visiondysfunction such as strabismus, amblyopia, anisometropia, oraniseikonia, the user may feel discomfort or may not feel VR (virtualreality) experience normally when the user uses the head mounted displayfor the VR experience.

SUMMARY

Example embodiments provide a method of driving a head mounted displaycapable of reducing the user's fatigue.

Example embodiments provide a head mounted display performing the methodof driving the head mounted display.

According to some example embodiments, a method of driving a headmounted display may include an operation of deriving a positionadjustment data by displaying a binocular position adjustment image on aleft-eye panel region and a right-eye panel region, an operation ofderiving a size adjustment data by displaying a binocular sizeadjustment image on the left-eye panel region and the right-eye panelregion, an operation of generating a luminance adjustment data based ona difference between a left-eye luminance perception data and aright-eye luminance perception data, an operation of converting an imagesource into an input image data based on at least one of the positionadjustment data, the size adjustment data, or the luminance adjustmentdata, and an operation of displaying an image corresponding to the inputimage data on the left-eye panel region and the right-eye panel region.

In example embodiments, the method of driving a head mounted display mayfurther include an operation of displaying a binocular balancing imageon the left-eye panel region and the right-eye panel region. Thebinocular balancing image may include a first left-eye image and a firstright-eye image, the first left-eye image including a fir left-eyeobject and displayed on the left-eye panel region, the first right-eyeimage including a first right-eye object and displayed on the right-eyepanel region.

In example embodiments, the operation of the deriving the positionadjustment data may include an operation of displaying a second left-eyeimage including a second left-eye object on the left-eye panel regionand a second right-eye image including a second right-eye object on theright-eye panel region, an operation of moving at least one of thesecond left-eye image or the second right-eye image in a first directionor a second direction orthogonal to the first direction based on aninput signal received from an input device, and an operation ofgenerating the position adjustment data based on a moved position towhich the at least one of the second left-eye image or the secondright-eye image is moved.

In example embodiments, a first color of the second left-eye object maybe complementary to a second color of the second right-eye object.

In example embodiments, the second left-eye object and the secondright-eye object may have different sizes and may have shapessubstantially the same to each other.

In example embodiments, the second left-eye object and the secondright-eye object may be symmetrical with each other and may have thesame size.

In example embodiments, the second left-eye image may further include afirst guide object of which position does not changed regardless of theinput signal. The second right-eye image may further include a secondguide object of which position does not changed regardless of the inputsignal. The first guide object and the second guide object may bedisposed at positions corresponding to each other.

In example embodiments, the operation of the deriving the sizeadjustment data may include an operation of displaying a third left-eyeimage including a third left-eye object on the left-eye panel region anda third right-eye image including a third right-eye object on theright-eye panel region, an operation of scaling at least one of thethird left-eye image or the third right-eye image in a first directionor in a second direction orthogonal to the first direction based on aninput signal received from an input device, and an operation ofgenerating the size adjustment data based on a scaled size to which theat least one of the third left-eye image or the third right-eye image isscaled.

In example embodiments, the third left-eye object and the thirdright-eye object may be symmetrical with each other and may have thesame size.

In example embodiments, the generating the luminance adjustment data mayinclude deriving the left-eye luminance perception data by displaying aleft-eye luminance perception image on the left-eye panel region, andderiving the right-eye luminance perception data by displaying aright-eye luminance perception image on the right-eye panel region. Theoperation of deriving the left-eye luminance perception data may includean operation of displaying a fourth left-eye image including a fourthleft-eye object on the left-eye panel region and a fourth right-eyeimage on the right-eye panel region, an operation of graduallyincreasing or decreasing a grayscale of the fourth left-eye object, andan operation of generating the left-eye luminance perception data basedon the grayscale of the fourth left-eye object at a time point when aninput signal is received from an input device.

In example embodiments, the fourth left-eye image may include abackground image having a first grayscale value. The grayscale of thefourth left-eye object may be increased or decreased every predeterminedperiod from the first grayscale value.

In example embodiments, the fourth right-eye image may include a fourthright-eye object including a plurality of rectangular shapes having aplurality of grayscale values.

In example embodiments, the operation of the deriving the right-eyeluminance perception data may include an operation of displaying a fifthleft-eye image on the left-eye panel region and a fifth right-eye imageincluding a fifth right-eye object on the right-eye panel region, anoperation of gradually increasing or decreasing a grayscale of the fifthright-eye object, and an operation of generating the right-eye luminanceperception data based on the grayscale of the fifth right-eye object ata time point when the input signal is received.

In example embodiments, the operation of the converting the image sourceinto the input image data may include an operation of adjusting a sizeof at least one of an input left-eye image or an input right-eye imageincluded in the image source based on the size adjustment data, anoperation of adjusting a display starting point of at least one of theinput left-eye image or the input right-eye image based on the positionadjustment data and the size adjustment data, and an operation ofadjusting a luminance of at least one of the input left-eye image or theinput right-eye image based on the luminance adjustment data.

According to some example embodiments, a method of driving a headmounted display may include an operation of deriving a binoculardisparity adjustment data by displaying a binocular disparity adjustmentimage on a left-eye panel region and a right-eye panel region, anoperation of generating an input image data by adjusting at least one ofan input left-eye image displayed on the left-eye panel region or aninput right-eye image displayed on the right-eye panel region based onthe binocular disparity adjustment data, and an operation of displayingan image corresponding to the input image data on the left-eye panelregion and the right-eye panel region.

In example embodiments, the binocular disparity adjustment data mayinclude at least one of a position shift value, a size ratio, or aluminance ratio of a right-eye image with respect to a left-eye image.

In example embodiments, the operation of deriving the binoculardisparity adjustment data includes an operation of displaying abinocular balancing image on the left-eye panel region and the right-eyepanel region, an operation of deriving a position adjustment data bydisplaying a binocular position adjustment image on the left-eye panelregion and the right-eye panel region, an operation of deriving a sizeadjustment data by displaying a binocular size adjustment image on theleft-eye panel region and the right-eye panel region, an operation ofderiving a left-eye luminance perception data by displaying a left-eyeluminance perception image on the left-eye panel region, an operation ofderiving a right-eye luminance perception data by displaying a right-eyeluminance perception image on the right-eye panel region, and anoperation of generating a luminance adjustment data based on adifference between the left-eye luminance perception data and theright-eye luminance perception data.

According to some example embodiments, a head mounted display mayinclude a display device configured to display an image on a left-eyepanel region and a right-eye panel region, and an image processorconfigured to derive a binocular disparity adjustment data by providinga binocular disparity adjustment image data to the display device,configured to generate input image data by adjusting at least one of aninput left-eye image data for the left-eye panel region or an inputright-eye image data for the right-eye panel region based on thebinocular disparity adjustment data, and configured to provide the inputimage data to the display device.

In example embodiments, the binocular disparity adjustment data mayinclude at least one of a position shift value, a size ratio, or aluminance ratio of a right-eye image with respect to a left-eye image.

In example embodiments, the image processor may include an adjustmentdata determiner configured to determine the binocular disparityadjustment data based on user information and driving information, andan input image generator configured to receive image source andconfigured to generate the input image data by adjusting at least one ofthe input left-eye image data or the input right-eye image data includedin the image source based on the binocular disparity adjustment data.

Therefore, a method of driving a head mounted display according toexample embodiments may derive a binocular disparity adjustment data,may differently adjust the left-eye image and the right-eye imageaccording to the characteristics of user's eyes based on the binoculardisparity adjustment data, and may display the adjusted image on aleft-eye panel region and a right-eye panel region. Accordingly, it ispossible to ensure user accessibility by the universal design and toreduce the fatigue of user.

In addition, a head mounted display according to example embodiments mayperform the method to correct the binocular disparity of the user,thereby reducing user's fatigue.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be described more fully hereinafter withreference to the accompanying drawings, in which various embodiments areshown.

FIGS. 1 and 2 are diagrams illustrating a head mounted display accordingto example embodiments.

FIG. 3 is a block diagram illustrating an example of a display deviceincluded in a head mounted display of FIG. 1.

FIG. 4 is a diagram illustrating an example of a display panel includedin a display device of FIG. 3.

FIGS. 5A and 5B are flow charts illustrating a method of driving a headmounted display according to one example embodiment.

FIG. 6 is a flow chart illustrating one example of a method of derivinga binocular disparity adjustment data in a method of driving a headmounted display of FIGS. 5A and 5B.

FIG. 7 is a diagram illustrating an example of a binocular balancingimage displayed on a display panel.

FIGS. 8A and 8B are diagrams illustrating an example of a binocularposition adjustment image displayed on a display panel.

FIGS. 9A and 9B are diagrams illustrating one example of a binocularsize adjustment image displayed on a display panel.

FIGS. 10A and 10B are diagrams illustrating another example of abinocular size adjustment image displayed on a display panel.

FIG. 11 is a diagram illustrating an example of a left-eye luminanceperception image displayed on a display panel.

FIG. 12 is a diagram illustrating an example of a right-eye luminanceperception image displayed on a display panel.

FIG. 13 is a flow chart illustrating another example of a method ofderiving a binocular disparity adjustment data in a method of driving ahead mounted display of FIGS. 5A and 5B.

FIGS. 14A and 14B are diagrams illustrating one example of a binocularposition adjustment image displayed on a display panel.

FIGS. 15A and 15B are diagrams illustrating another example of abinocular position adjustment image displayed on a display panel.

FIGS. 16A and 16B are diagrams illustrating still another example of abinocular position adjustment image displayed on a display panel.

FIGS. 17A and 17B are diagrams illustrating still another example of abinocular position adjustment image displayed on a display panel.

FIGS. 18 and 19 are diagrams illustrating examples of a binoculardisparity adjustment image displayed on a display panel.

FIG. 20 is a flow chart illustrating an example of a method ofdifferently displaying an image on a left-eye panel region and aright-eye panel region in a method of driving a head mounted display ofFIGS. 5A and 5B.

DESCRIPTION OF EMBODIMENTS

Exemplary embodiments will be described more fully hereinafter withreference to the accompanying drawings, in which various embodiments areshown.

FIGS. 1 and 2 are diagrams illustrating a head mounted display accordingto example embodiments.

Referring to FIGS. 1 and 2, the head mounted display 1000 may include adisplay device 100, an image processor 200, an image source device 300,a processor 400, a housing 500, an input device 600, and a lens 700. Forexample, the display device 100, the image processor 200, the imagesource device 300, and the processor 400 may be located inside of thehousing 500 surrounding them.

The display device 100 may display an image corresponding to the inputimage data IDATA received from the image processor 200 on a left-eyepanel region and a right-eye panel region. For example, the displaydevice 100 may display a left-eye image on the left-eye panel regionrecognized by the user's left-eye and a right-eye image on the right-eyepanel region recognized by the user's right-eye based on the input imagedata IDATA.

The image processor 200 may provide an image data corresponding to abinocular disparity adjustment image to the display device 100 toperform a binocular disparity test operation for each user and mayderive a binocular disparity adjustment data SD. Here, the binoculardisparity indicates the difference in the visual perceptions of theuser's left-eye and right-eye. The binocular disparity test operationmay be for measuring the binocular disparity. The binocular disparitytest operation may include a binocular position perception testoperation for measuring a difference in position perceptions of botheyes, a binocular size perception test operation for measuring adifference in size perceptions of both eyes, a binocular luminanceperception test operation for measuring a difference in luminanceperceptions of both eyes, etc. Hereinafter, a method of performing thebinocular disparity test operation and deriving the binocular disparityadjustment data SD will be described in more detail with reference tothe FIGS. 6 through 19.

The image processor 200 may adjust at least one of an input left-eyeimage data for the left-eye panel region or an input right-eye imagedata for the right-eye panel region based on the binocular disparityadjustment data SD. In one example embodiment, the binocular disparityadjustment data SD may include at least one of a position shift value, asize ratio, or a luminance ratio of a right-eye image with respect to aleft-eye image. Thus, the image processor 200 may adjust at least one ofdisplaying positions, sizes, or luminances of the input left-eye imagedata and/or the input right-eye image data based on the binoculardisparity adjustment data SD to display the differentially adjusted theleft-eye and right-eye images according to the characteristics of user'sboth eyes on the left-eye panel region and the right-eye panel region.The image processor 200 may generate the input image data IDATAcorresponding to adjusted image and may provide the input image dataIDATA to the display device 100, thereby differentially driving the leftdisplay panel (i.e., the left-eye panel region) and the right displaypanel (i.e., the right-eye panel region).

In one example embodiment, the image processor 200 may include anadjustment data storage 210, an adjustment data determiner 230, and aninput image generator 250.

The adjustment data storage 210 may store the binocular disparityadjustment data SD for each user derived by performing the binoculardisparity test operations. For example, the adjustment data storage 210may include a non-volatile memory device such as an erasableprogrammable read-only memory (EPROM) device, an electrically erasableprogrammable read-only memory (EEPROM) device, a flash memory device, aphase change random access memory (PRAM) device, a resistance randomaccess memory (RRAM) device, a nano floating gate memory (NFGM) device,a polymer random access memory (PoRAM) device, a magnetic random accessmemory (MRAM) device, a ferroelectric random access memory (FRAM)device, etc.

The adjustment data determiner 230 may receive user information UD fromthe processor and may search the binocular disparity adjustment data SDcorresponding to the received user information UD from the adjustmentdata storage 210. For example, the head mounted display 1000 may sensethe biometric information of the user (e.g., iris information,fingerprint information, etc.), and then the adjustment data determiner230 may receive user information UD corresponding to sensed biometricinformation to determine the binocular disparity adjustment data SD.

In one example embodiment, the adjustment data determiner 230 mayreceive driving information MD and may search the binocular disparityadjustment data SD corresponding to the driving information MD from theadjustment data storage 210. For example, the processor 400 in the headmounted display 1000 may provide the driving information MD including aresolution of image source, a driving time, etc. to the adjustment datadeterminer 230, and then the adjustment data determiner 230 maydetermine the binocular disparity adjustment data SD corresponding tothe resolution of image source or the driving time. For example, whenthe resolution of image source is relatively high or the driving timeexceeds 1 hour, the user can feel the fatigue caused by the correctionof binocular disparity. Therefore, the adjustment data determiner 230may apply a gain value for lowering the degree of correction ofbinocular disparity to the binocular disparity adjustment data SD.

The input image generator 250 may receive image source IS and maygenerate the input image data IDATA by adjusting at least one of theinput left-eye image data or the input right-eye image data included inthe image source IS based on the binocular disparity adjustment data SD.

The image source device 300 may provide the image source IS to the inputimage generator 250. For example, the image source device 300 may loadthe image data stored in a storage and may provide the loaded image datato the input image generator 250 of the image processor 200 to displayan image on the display device 100.

The processor 400 may provide a variety of information for determiningthe binocular disparity adjustment data SD to the adjustment datadeterminer 230. While the binocular disparity adjustment image isdisplayed, the processor 400 may receive a user input from the inputdevice 600, may generate the binocular disparity adjustment data SDbased on the user input, and may store the binocular disparityadjustment data SD in the adjustment data storage 210. In addition, theprocessor 400 may generate the user information UD corresponding to thebiometric information by sensing the biometric information of the user(e.g., iris information, fingerprint information, etc.) and may generatethe driving information MD including the resolution of image source, thedriving time, etc.

The input device 600 may receive a user input while the binoculardisparity test operation is performed. For example, the input device 600may directly receive the user input via a wired manner (e.g., using aphysical button) or indirectly receive the user input via a wirelessmanner (e.g., using a remote controller).

In addition, the head mounted display 1000 may further include a housing500 for protecting the display device 100 and the lens 700 in thehousing 500. The head mounted display 1000 may further include lens,reflectors, optical elements, and the like for forming or adjusting anoptical path in order that an image displayed on the display device 100is provided to the user's eyes.

FIG. 3 is a block diagram illustrating an example of a display deviceincluded in a head mounted display of FIG. 1. FIG. 4 is a diagramillustrating an example of a display panel included in a display deviceof FIG. 3.

Referring to FIGS. 3 and 4, the display device 100 may include a displaypanel 110 and a panel driver. The panel driver may include a scan driver120, a data driver 130, and a controller 140.

The display panel 110 may include a left-eye panel region 110L and aright-eye panel region 110R each including a plurality of pixels. Forexample, as shown in FIG. 4, the left-eye panel region 110L may includea first left-eye display region DR-L on which a left-eye image isdisplayed and a second left-eye display region BR-L on which a blackimage is displayed. The left-eye image may be recognized by user'sleft-eye. The second left-eye display region BR-L may be located outsideof the first left-eye display region DR-L to surround the first left-eyedisplay region DR-L. The right-eye panel region 110R may include a firstright-eye display region DR-R on which a right-eye image is displayedand a second right-eye display region BR-R on which a black image isdisplayed. The right-eye image may be recognized by user's right-eye.The second right-eye display region BR-R may be located outside of thefirst right-eye display region DR-R to surround the first right-eyedisplay region DR-R.

The scan driver 120 may provide scan signals to the pixels via the scanlines SL1 through SLn based on a first control signal CTL1.

The data driver 130 may receive a second control signal CTL2 and outputimage data ODATA. The data driver 130 may convert the output image dataODATA into analog type data signals, and then may provide the converteddata signals to the pixels via the data lines DL1 through DLm based onthe second control signal CTL2.

The controller 140 may control the scan driver 120 and the data driver130 to display an image corresponding to input image data IDATA. Thecontroller 140 may receive input image data IDATA from the imageprocessor 400. The controller 140 may generate first and second controlsignals CTL1 and CTL2 to control the scan driver 120 and the data driver130, respectively. For example, the first control signal CTL1 forcontrolling the scan driver 120 may include a vertical start signal, ascan clock signal, etc. The second control signal CTL2 for controllingthe data driver 130 may include a horizontal start signal, a loadsignal, etc. The controller 140 may generate digital type output imagedata ODATA compatible to the operation condition of the display panel110 based on the input image data IDATA, and then provide the outputimage data ODATA to the data driver 130.

Although the example embodiments of FIGS. 3 and 4 describe that theleft-eye panel region 110L and the right-eye panel region 110R aredriven by the same scan driver and the same data driver, it is notlimited thereto. For example, the display device may include a firstscan driver and a first data driver for driving the left-eye panelregion 110L, and a second scan driver and a second data driver fordriving the right-eye panel region 110R.

Although the example embodiments of FIGS. 3 and 4 describe that thedisplay device 100 includes single display panel 110 having a left-eyepanel region 110L and a right-eye panel region 110R, a structure of thedisplay panel is not limited thereto. For example, the display device100 includes a first display panel having a left-eye panel region and asecond display panel having a right-eye panel region.

FIGS. 5A and 5B are flow charts illustrating a method of driving a headmounted display according to one example embodiment.

Referring to FIGS. 5A and 5B, the method of driving the head mounteddisplay is provided. The method may display a binocular disparityadjustment image on a left-eye panel region and a right-eye panel region(S100) and may derive a binocular disparity adjustment data SD. Thebinocular disparity adjustment data SD may include at least one of aposition shift value, a size ratio, or a luminance ratio of a right-eyeimage with respect to a left-eye image.

As shown in FIG. 5B, at least one of the position shift value foradjusting position deviation, the size ratio for adjusting sizedeviation, or the luminance ratio for adjusting luminance deviation maybe derived as the binocular disparity adjustment data SD by displayingthe binocular disparity adjustment image. In one example embodiment,when it is required to adjust binocular balance (S101), a binocularbalancing image may be displayed on the left-eye panel region and theright-eye panel region (S102). When it is required to adjust binocularposition deviation (S103), the binocular position perception testoperation for adjusting the position of the right-eye with respect tothe left-eye may be performed (S104). For example, a position adjustmentdata may be derived by displaying a binocular position adjustment imageon the left-eye panel region and the right-eye panel region. When it isrequired to adjust binocular size deviation (S105), the binocular sizeperception test operation for adjusting the size ratio of the right-eyeimage with respect to the left-eye image in the first direction and/orthe second direction may be performed (S106). For example, a sizeadjustment data may be derived by displaying a binocular size adjustmentimage on the left-eye panel region and the right-eye panel region. Whenit is required to adjust binocular luminance deviation (S107), thebinocular luminance perception test operation for adjusting theluminance ratio of the right-eye image with respect to the left-eyeimage may be performed (S108). For example, a left-eye luminanceperception data may be derived by displaying a left-eye luminanceperception image on the left-eye panel region. A right-eye luminanceperception data may be derived by displaying a right-eye luminanceperception image on the right-eye panel region. A luminance adjustmentdata may be generated based on a difference between the left-eyeluminance perception data and the right-eye luminance perception data.

The derived binocular disparity adjustment data SD may be stored in anadjustment data storage (S300). For example, the binocular disparityadjustment data SD for each of the registered users of the head mounteddisplay may be stored in the adjustment data storage with userinformation. Because the binocular disparities for registered users aredifferent from each other, the binocular disparity adjustment data SDfor each user may be derived respectively and the binocular disparityfor each user can be corrected.

The driving mode related to the degree of correction of the binoculardisparity may be selected (S500). If the user has binocular visiondysfunction, it may give a strain on the user's eyes because the headmounted display displays the corrected image of the binocular disparityfor a long time. Therefore, it is possible to determine whether or notto correct the binocular disparity or to select the driving mode to varythe degree of correction based on a user's input or the drivinginformation (e.g., the resolution of the image source, the driving time,etc.).

The image may be differentially displayed on the left-eye panel regionand the right-eye panel region based on the binocular disparityadjustment data SD (S700). Thus, the image processor may determine thebinocular disparity adjustment data SD based on the user information andthe selected driving mode, and may generate input image data byadjusting at least one of input left-eye image data or input right-eyeimage data based on the determined binocular disparity adjustment dataSD. In addition, the display device may display the left-eye image andthe right-eye image corresponding to the input image data on theleft-eye panel region and the right-eye panel region, respectively.Hereinafter, a method of differentially displaying the image on theleft-eye panel region and the right-eye panel region based on thebinocular disparity adjustment data SD will be described in more detailwith reference to the FIG. 20.

FIG. 6 is a flow chart illustrating one example of a method of derivinga binocular disparity adjustment data SD in a method of driving a headmounted display of FIGS. 5A and 5B. FIG. 7 is a diagram illustrating anexample of a binocular balancing image displayed on a display panel.FIGS. 8A and 8B are diagrams illustrating an example of a binocularposition adjustment image displayed on a display panel. FIGS. 9A and 9Bare diagrams illustrating one example of a binocular size adjustmentimage displayed on a display panel. FIGS. 10A and 10B are diagramsillustrating another example of a binocular size adjustment imagedisplayed on a display panel. FIG. 11 is a diagram illustrating anexample of a left-eye luminance perception image displayed on a displaypanel. FIG. 12 is a diagram illustrating an example of a right-eyeluminance perception image displayed on a display panel.

Referring to FIGS. 6 through 12, the binocular disparity adjustment dataSD may be derived by performing the binocular disparity test operations(e.g., a binocular position perception test operation, a binocular sizeperception test operation, and a binocular luminance perception testoperation).

A binocular balancing image may be displayed on the left-eye panelregion and the right-eye panel region (S110). Even in the case of thesame user, the binocular disparity may be measured differently dependingon the wearing state of the head mounted display. Therefore, in order toaccurately perform the binocular disparity test operations, the headmounted display may display the binocular balancing image on theleft-eye panel region and the right-eye panel region, and the user mayadjust the wearing state on the basis of the binocular balancing image.

As shown in FIG. 7, the head mounted display may display a left-eyeimage LI on the left-eye panel region and a right-eye image RI on theright-eye panel region as the binocular balancing image. The left-eyeimage LI may include a first left-eye object S1-L. The right-eye imageRI may include a first right-eye object S1-R. The first left-eye objectS1-L and the first right-eye object S1-R may have substantially the sameshapes. For example, the first left-eye object S1-L and the firstright-eye object S1-R may be straight lines extending in the firstdirection D1 (i.e., the horizontal direction). Accordingly, the user mayadjust the wearing state of the head mounted display such that the firstleft-eye object S1-L and the first right-eye object S1-R overlap eachother to be in a single line.

The binocular position perception test operation for adjusting theposition of the right-eye with respect to the left-eye may be performed(S120). For example, because the difference in position between theleft-eye and the right-eye may be relatively largely perceived by theuser having strabismus, it is necessary to adjust positions of theleft-eye image and the right-eye image. A position adjustment data maybe derived by displaying the binocular position adjustment image on theleft-eye panel region and the right-eye panel region.

As shown in FIG. 8A, to perform the binocular position perception testoperation, the head mounted display may display a left-eye image LIincluding a second left-eye object S2-L on the left-eye panel region anda right-eye image RI including a second right-eye object S2-R on theright-eye panel region. In one example embodiment, the second left-eyeobject S2-L and the second right-eye object S2-R may have differentsizes and have substantially the same shape. In one example embodiment,a first color of the second left-eye object S2-L may be complementary toa second color of the second right-eye object S2-R. For example, thesecond left-eye object S2-L may be a red color circle having a visualangle of about 5 to about 10 degrees and may be disposed on the centerof the left-eye image LI. The second right-eye object S2-R may be a cyancolor circle having a visual angle of about 1 degree and may be disposedon the center of the right eye image RI or deviated from the center ofthe right eye image RI and disposed on the right side of the center, forexample.

As shown in FIG. 8B, the user may move the right-eye image RI in a firstdirection D1 using an input device 600. The x-axis value of the positionof the right-eye image RI corresponding to the first direction D1 may beincreased or decreased using the input device 600 to place the movedsecond right-eye object S2-R′ at the center of the second left-eyeobject S2-L. The position adjustment data can be generated based on adistance and a direction that the right-eye image RI has been moved inthe first direction D1. When the first color of the second left-eyeobject S2-L and the second color of the second right-eye object S2-R′are complementary to each other, the second right-eye object S2-R′ canbe more clearly distinguished from the second left-eye object S2-L, andthen the position adjustment data can be derived more accurately.

Although the example embodiments of FIGS. 8A and 8B describe that thesecond left-eye object S2-L and the second right-eye object S2-R havethe circle shapes, the second left-eye object S2-L and the secondright-eye object S2-R may have a variety of shapes such as a linearshape, an arrow shape, a cross shape, a composite shape composed ofvarious shapes, etc.

A binocular size perception test operation may be performed to adjustthe size ratio of the right-eye image with respect to the left-eye imagein the second direction (S130). For example, if the user has a binocularvision dysfunction (e.g., aniseikonia), the difference in viewing sizebetween the left-eye and the right-eye can be largely perceived.Therefore, it needs to adjust the sizes of the left-eye image and theright-eye image. Accordingly, a size adjustment data may be derived bydisplaying a binocular size adjustment image on the left-eye panelregion and the right-eye panel region.

As shown in FIG. 9A, in the binocular size perception test operation,the head mounted display may display a left-eye image LI including athird left-eye object S3-L on the left-eye panel region and a right-eyeimage RI including a third right-eye object S3-R on the right-eye panelregion. In one example embodiment, the third left-eye object S3-L andthe third right-eye object S3-R may be symmetrical with each other andmay have the same size. For example, in order to adjust the size withrespect to the second direction D2, the third left-eye object S3-L maybe a left semicircle of a circle having a visual angle of about 5 toabout 10 degrees and may be disposed on the left side of the center ofthe left-eye image LI. The third right-eye object S3-R may be a rightsemicircle of the circle having the visual angle of about 5 to about 10degrees and may be disposed on the right side of the center of theright-eye image RI. The third left-eye object S3-L and the thirdright-eye object S3-R may have achromatic color and may have brightnessdifferent from brightness of a background image.

As shown in FIG. 9B, the user may scale a size of the right-eye image RIin y-axis corresponding to a second direction D2 using an input devicesuch that the scaled third right-eye object S3-R′ and the third left-eyeobject S3-L are recognized as a single circle. The size adjustment datamay be generated based on a scaled size (or up-scaling ratio) to whichthe third right-eye image RI is scaled in the second direction D2.

A binocular size perception test operation may be performed to adjustthe size ratio of the right-eye image with respect to the left-eye imagein the first direction (S140).

As shown in FIG. 10A, in the binocular size perception test operation,the third left-eye object S3-L may be an upper semicircle of a circlehaving a visual angle of about 5 to about 10 degrees and may be disposedon the upper side of the center of the left-eye image LI. The thirdright-eye object S3-R may be a lower semicircle of the circle having thevisual angle of about 5 to about 10 degrees and may be disposed on thelower side of the center of the right-eye image RI.

As shown in FIG. 10B, the user may scale a size of the right-eye imageRI in x-axis corresponding to a first direction D1 using the inputdevice such that the scaled third right-eye object S3-R′ and the thirdleft-eye object S3-L are recognized as a single circle. The sizeadjustment data may be generated based on the scaled size (or up-scalingratio) to which the third right-eye image RI is scaled in the firstdirection D1.

A left-eye luminance perception test operation for measuring a luminancedifference perception degree of the left-eye may be performed (S150),and then a right-eye luminance perception test operation for measuring aluminance difference perception degree of the right-eye may be performed(S160). For example, because the difference in luminance between theleft-eye and the right-eye may be relatively largely perceived by theuser having amblyopia or anisometropia, it is necessary to adjustluminances of the left-eye image and the right-eye image. Therefore, aleft-eye luminance perception data may be derived by displaying aleft-eye luminance perception image on the left-eye panel region. Aright-eye luminance perception data may be derived by displaying aright-eye luminance perception image on the right-eye panel region. Andthen a luminance adjustment data may be generated based on a differencebetween the left-eye luminance perception data and the right-eyeluminance perception data.

As shown in FIG. 11, in the left-eye luminance perception testoperation, the head mounted display may display a left-eye image LIincluding a fourth left-eye object S4-L on the left-eye panel region anda right-eye image RI including a fourth right-eye object S4-R on theright-eye panel region to derive the left-eye luminance perception data.The left-eye image LI may further include a background image having afirst grayscale value, and the grayscale of the fourth left-eye objectS4-L may be increased or decreased every predetermined period from thefirst grayscale value. In addition, the fourth right-eye object S4-R mayinclude a plurality of achromatic rectangles having a plurality ofgrayscale values to accurately derive the left-eye luminance perceptiondata by dispersing the user's concentration. For example, the backgroundimage of the left-eye image LI may have 250 grayscale, the fourthleft-eye object S4-L may have an arrow shape having a visual angle ofabout 5 to about 10 degrees, and then the grayscale of the fourthleft-eye object S4-L may be decreased by 1 grayscale every 500 ms from250 grayscale that is the same as the grayscale of the background image.The user inputs to the input device when the fourth left-eye object S4-Lhaving the arrow shape is recognized by the user. The left-eye luminanceperception data may be generated based on the grayscale of the fourthleft-eye object S4-L at a time point when an input signal is receivedfrom an input device. For example, if the user recognize the fourthleft-eye object S4-L when the grayscale of the fourth left-eye objectS4-L corresponding to the second grayscale value (e.g., 220 grayscale),a difference between the first grayscale and the second grayscale (e.g.,250 grayscale−220 grayscale=30) may be set as the left-eye luminanceperception data.

As shown in FIG. 12, in the right-eye luminance perception testoperation, the head mounted display may display a left-eye image LIincluding a fifth left-eye object S5-L on the left-eye panel region anda right-eye image RI including a fifth right-eye object S5-R on theright-eye panel region to derive the right-eye luminance perceptiondata. The right-eye image RI may further include a background imagehaving a first grayscale value, and the grayscale of the fifth right-eyeobject S5-R may be increased or decreased every predetermined periodfrom the first grayscale value. In addition, the fifth left-eye objectS5-L may include a plurality of achromatic rectangles having a pluralityof grayscale values to accurately derive the right-eye luminanceperception data by dispersing the user's concentration. For example, thebackground image of the right-eye image RI may have 250 grayscale, thefifth right-eye object S5-R may have an arrow shape having a visualangle of about 5 to about 10 degrees, and then the grayscale of thefifth right-eye object S5-R may be decreased by 1 grayscale every 500 msfrom 250 grayscale that is the same as the grayscale of the backgroundimage. The user inputs to the input device when the fifth right-eyeobject S5-R having the arrow shape is recognized by the user. Theright-eye luminance perception data may be generated based on thegrayscale of the fifth right-eye object S5-R at a time point when theinput signal is received from the input device. For example, if the userrecognize the fifth right-eye object S5-R when the grayscale of thefifth right-eye object S5-R corresponding to the third grayscale value(e.g., 235 grayscale), a difference between the first grayscale and thethird grayscale (e.g., 250 grayscale−235 grayscale=15) may be set as theright-eye luminance perception data. Accordingly, the luminanceadjustment data may be set to a difference between the left-eyeluminance perception data and the right-eye luminance perception data(e.g., 30−15=15).

Therefore, the binocular disparity test operations such as a binocularposition perception test operation, a binocular size perception testoperation, and a binocular luminance perception test operation areperformed, and then the position adjustment data, the size adjustmentdata, and the luminance adjustment data are derived to differentiallydrive the left-eye panel region and the right-eye panel region accordingto the characteristics of user's eyes.

Although the example embodiments of FIGS. 11 and 12 describe that thegrayscale of the fourth left-eye object S4-L or the grayscale of thefifth right-eye object S5-R is gradually decreased, the grayscale of thefourth left-eye object S4-L or the grayscale of the fifth right-eyeobject S5-R can be gradually increased from a background image havingzero gray scale.

Although the example embodiments of FIG. 6 describe that binocularposition perception test operation, the binocular size perception testoperations, and the luminance perception test operations are performedsequentially, procedure of the test operations is not limited thereto.For example, the test operations may be performed selectively, and theorder of the test operations may be determined in various ways.

FIG. 13 is a flow chart illustrating another example of a method ofderiving a binocular disparity adjustment data SD in a method of drivinga head mounted display of FIGS. 5A and 5B. FIGS. 14A and 14B arediagrams illustrating one example of a binocular position adjustmentimage displayed on a display panel. FIGS. 15A and 15B are diagramsillustrating another example of a binocular position adjustment imagedisplayed on a display panel. FIGS. 16A and 16B are diagramsillustrating still another example of a binocular position adjustmentimage displayed on a display panel. FIGS. 17A and 17B are diagramsillustrating still another example of a binocular position adjustmentimage displayed on a display panel. FIGS. 18 and 19 are diagramsillustrating examples of a binocular disparity adjustment imagedisplayed on a display panel.

Referring to FIGS. 13 through 19, the binocular disparity adjustmentdata SD may be derived by performing the binocular disparity testoperations (e.g., a binocular position perception test operation, abinocular size perception test operation, or a binocular luminanceperception test operation). The method of deriving the binoculardisparity adjustment data SD according to the present exemplaryembodiment is substantially the same as the method of the exemplaryembodiment described in FIG. 6, except that the operation of adjusting aposition of a right-eye image with respect to a left-eye image in asecond direction. Therefore, the same reference numerals will be used torefer to the same or like parts as those described in the previousexemplary embodiment of FIG. 6, and any repetitive explanationconcerning the above elements will be omitted.

A first binocular position perception test operation may be performed toadjust the position of the right-eye with respect to the left-eye in thefirst direction D1 (S210).

As shown in FIG. 14A, the head mounted display may display a left-eyeimage LI including a sixth left-eye object S6-L on the left-eye panelregion and a right-eye image RI including a sixth right-eye object S6-Ron the right-eye panel region. For example, the sixth left-eye objectS6-L may be a red color straight line extending in the second directionD2 and may be disposed on the center of the left-eye image LI. The sixthright-eye object S6-R may be a cyan color circle having a visual angleof about 1 degree and may be disposed on the center of the right eyeimage RI or deviated from the center of the right eye image RI anddisposed on the right side of the center, for example.

As shown in FIG. 14B, the user may move the right-eye image RI in afirst direction D1 using an input device, thus, the x-axis value of theposition of the right-eye image RI corresponding to the first directionD1 may be increased or decreased, such that the sixth left-eye objectS6-L overlaps the center point of the moved sixth right-eye objectS6-R′. The position adjustment data can be generated based on a distancethat the right-eye image RI has been moved in the first direction D1.

A second binocular position perception test operation may be performedto adjust the position of the right-eye with respect to the left-eye inthe second direction D2 (S220).

In one example embodiment, as shown in FIG. 15A, the head mounteddisplay may display a left-eye image LI including a seventh left-eyeobject S7-L on the left-eye panel region and a right-eye image RIincluding a seventh right-eye object S7-R on the right-eye panel region.For example, the seventh left-eye object S7-L may be an upper semicircleof a circle having a visual angle of about 5 to about 10 degrees and maybe disposed on the upper side of the center of the left-eye image LI.The seventh right-eye object S7-R may be a lower semicircle of a circlehaving a visual angle of about 5 to about 10 degrees and may be disposedon the lower right side of the center of the right-eye image RI.

As shown in FIG. 15B, the user may move the right-eye image RI in thefirst direction D1 and the second direction D2 using the input devicesuch that the moved seventh right-eye object S7-R′ and the seventhleft-eye object S7-L are recognized as a single circle. The positionadjustment data can be generated based on a distance that the right-eyeimage RI has been moved in the first direction D1 and the seconddirection D2.

In another example embodiment, as shown in FIG. 16A, in the secondbinocular position perception test operation, the head mounted displaymay display a left-eye image LI including an eighth left-eye object S8-Lon the left-eye panel region and a right-eye image RI including aneighth right-eye object S8-R on the right-eye panel region. For example,the eighth left-eye object S8-L may be a right arrow shape and may bedisposed on the left side of the center of the left-eye image LI. Theeighth right-eye object S8-R may be a left arrow shape and may bedisposed on the right side of the center of the right-eye image RI.

As shown in FIG. 16B, the user may move the right-eye image RI in thefirst direction D1 and the second direction D2 using the input devicesuch that the moved eighth right-eye object S8-R′ and the eighthleft-eye object S8-L are contact with each other at arrowhead. Theposition adjustment data can be generated based on a distance that theright-eye image RI has been moved in the first direction D1 and thesecond direction D2.

In still another example embodiment, as shown in FIG. 17A, in the secondbinocular position perception test operation, the head mounted displaymay display a left-eye image LI including an ninth left-eye object S9-Lon the left-eye panel region and a right-eye image RI including an ninthright-eye object S9-R on the right-eye panel region. For example, theninth left-eye object S9-L and the ninth right-eye object S9-R may havean L-shape. The ninth left-eye object S9-L and the ninth right-eyeobject S9-R may be in a point symmetry. The ninth left-eye object S9-Lmay be disposed in the upper left of the center of the right-eye imageRI and the ninth right-eye object S9-R may be disposed in the lowerright of the center of the right-eye image RI

As shown in FIG. 17B, the user may move the right-eye image RI in thefirst direction D1 and the second direction D2 using the input devicesuch that corners of the moved ninth right-eye object S9-R′ and theninth left-eye object S9-L are contact with each other. The positionadjustment data can be generated based on a distance that the right-eyeimage RI has been moved in the first direction D1 and the seconddirection D2.

A binocular size perception test operation may be performed to adjustthe size ratio of the right-eye image with respect to the left-eye image(S230). Since the method of adjusting the size of the right-eye imagewith respect to the left-eye image is described above, duplicateddescriptions will be omitted.

In one example embodiment, in the binocular position adjustment image orthe binocular size adjustment image, the left-eye image may furtherinclude a first guide object of which position does not changedregardless of the input signal, the right-eye image may further includea second guide object of which position does not changed regardless ofthe input signal, and the first guide object and the second guide objectmay be disposed at positions corresponding to each other. Accordingly,because the user can adjust the relative position or the relative sizeof the first object and the second object on the basis of the first andsecond guide objects, the position adjustment data or the sizeadjustment data may be derived more accurately.

In one example, as shown in FIG. 18, the left-eye image LI may include afirst guide object GF1-L having four black square shapes located at fourcorners and a tenth left-eye object S10-L. The right-eye image RI mayinclude a second guide object GF1-R having four black square shapeslocated at four corners and a tenth right-eye object S10-R. In anotherexample, as shown in FIG. 19, the left-eye image LI may include a firstguide object GF2-L having a ‘+’-shape at the center of the left-eyeimage LI and an eleventh left-eye object S11-L. The right-eye image RImay include a second guide object GF2-R having a ‘+’-shape at the centerof the right-eye image RI and an eleventh right-eye object S11-R.

A left-eye luminance perception test operation for measuring a luminancedifference perception degree of the left-eye may be performed (S250),and then a right-eye luminance perception test operation for measuring aluminance difference perception degree of the right-eye may be performed(S260). Since the methods of the luminance difference perception degreeof the left-eye or the right-eye, are described above, duplicateddescriptions will be omitted.

FIG. 20 is a flow chart illustrating an example of a method ofdifferently displaying an image on a left-eye panel region and aright-eye panel region in a method of driving a head mounted display ofFIGS. 5A and 5B.

Referring to FIG. 20, in the method of driving a head mounted display,the user wearing the head mounted display may be verified todifferentially drive a left display panel (i.e., the left-eye region)and a right display panel (i.e., a right-eye region) (S710). Forexample, the head mounted display may sense biometric information (e.g.,iris information, fingerprint information, etc.) of the user and maysearch the user information corresponding to the sensed biometricinformation from the user information storage (not shown) (e.g., userinformation database management system).

The head mounted display may load the adjustment data for the verifieduser (S720). For example, the head mounted display may search and loadthe position adjustment data, the size adjustment data, and theluminance adjustment data corresponding to the verified user from theadjustment data storage.

The head mounted display may adjust a start point and a size of at leastone of left-eye image or right-eye image based on the positionadjustment data and the size adjustment data (S730).

In one example embodiment, a size of at least one of an input left-eyeimage or an input right-eye image included in image source may beadjusted based on the size adjustment data. For example, the sizeadjustment data may include a scaling factor indicating a ratio of asize of the adjusted image to a size of the original image. The size ofthe left-eye image after the adjustment may be calculated according to[Equation 1].

WLa=WLb*SFLw,

HLa=HLb*SFLh   [Equation 1]

-   -   Here, WLa indicates a width of the left-eye image after the        adjustment, WLb indicates a width of the left-eye image before        the adjustment, SFLw indicates a scaling factor for a width of        the left-eye image, HLa indicates a height of the left-eye image        after the adjustment, HLb indicates a height of the left-eye        image before the adjustment, SFLh indicates a scaling factor for        a height of the left-eye image.

In the same way, the size of the right-eye image after the adjustmentmay be calculated according to [Equation 2].

WRa=WRb*SFRw,

HRa=HRb*SFRh   [Equation 2]

-   -   Here, WRa indicates a width of the right-eye image after the        adjustment, WRb indicates a width of the right-eye image before        the adjustment, SFRw indicates a scaling factor for a width of        the right-eye image, HRa indicates a height of the right-eye        image after the adjustment, HRb indicates a height of the        right-eye image before the adjustment, SFRh indicates a scaling        factor for a height of the right-eye image.

In one example embodiment, a start point of at least one of the left-eyeimage or the right-eye image may be adjusted based on the positionadjustment data and the size adjustment data. For example, the positionadjustment data may include a position shift value of a right-eye imagewith respect to a left-eye image. Both of the input left-eye image andthe input right-eye image may be move by an amount of half of theposition shift value in opposite direction, respectively. In this case,the start point of the left-eye image after the adjustment may becalculated according to [Equation 3].

PSLx=PCLx−WLa/2+(SDx/2),

PSLy=PCLy−HLa/2+(SDy/2)   [Equation 3]

-   -   Here, PSLx indicates x-value of the start point of the left-eye        image after the adjustment, PCLx indicates x-value of the center        point of the left-eye image before the adjustment, WLa indicates        a width of left-eye image after the adjustment, SDx indicates        x-value of a position shift value, PSLy indicates y-value of the        start point of the left-eye image after the adjustment, PCLy        indicates y-value of the center point of the left-eye image        before the adjustment, HLa indicates a height of left-eye image        after the adjustment, SDy indicates y-value of the position        shift value.

In the same way, the start point of the right-eye image after theadjustment may be calculated according to [Equation 4].

PSRx=PCRx−WRa/2−(SDx/2),

PSRy=PCRy−HRa/2−(SDy/2)   [Equation 4]

-   -   Here, PSRx indicates x-value of the start point of the right-eye        image after the adjustment, PCRx indicates x-value of the center        point of the right-eye image before the adjustment, WRa        indicates a width of right-eye image after the adjustment, SDx        indicates x-value of a position shift value, PSRy indicates        y-value of the start point of the right-eye image after the        adjustment, PCRy indicates y-value of the center point of the        right-eye image before the adjustment, HRa indicates a height of        right-eye image after the adjustment, SDy indicates y-value of        the position shift value.

The head mounted display may adjust a luminance of at least one ofleft-eye image or right-eye image based on the luminance adjustment data(S740). The luminance adjustment data may be generated based on adifference between the left-eye luminance perception data and theright-eye luminance perception data. An adjustment value correspondingto the luminance adjustment data may be derived using the look-up table.The adjustment value may be applied to the input left-eye image or theinput right-eye image to adjust the luminance. For example, when theleft-eye luminance perception data is greater than the right-eyeluminance perception data (i.e., when the left-eye responds moresensitively to luminance than the right-eye), the luminance perceived byboth eyes may be adjusted to substantially the same level by increasingthe luminance of the right-eye image with respect to the luminance ofthe left-eye image or by decreasing the luminance of the left-eye imagewith respect to the luminance of the right-eye image. In this time, theluminance of the left-eye image and the luminance of the right-eye imagemay be adjusted by various dimming methods such as a method of adjustingthe image data, a method of changing the gamma curve, a method ofadjusting the emission duration time, etc.

The head mounted display may differentially display the left-eye imageand the right-eye image (S750). Thus, the head mounted display maydisplay the adjusted image generated by differentially adjusting theleft eye image and the right eye image according to the characteristicsof user's eyes on the left-eye panel region (i.e., left panel region)and the right-eye panel region (i.e., right panel region).

Unlike the three-dimensional (3D) display, the head-mounted displayindependently outputs the left-eye image and the right-eye image.Accordingly, cross talk may not occur in the head-mounted display.Therefore, the binocular disparity can be accurately leveled orquantified according to the binocular difference. In result, thehead-mounted display may display the left-eye image and the right-eyeimage that are differentially adjusted according to the characteristicsof user's eyes on the left-eye panel region and the right-eye panelregion, respectively. It is possible to secure user accessibilitythrough universal design and to reduce fatigue of the user.

Although a method of driving head mounted display and a head mounteddisplay performing the method according to example embodiments have beendescribed with reference to figures, those skilled in the art willreadily appreciate that many modifications are possible in the exampleembodiments without materially departing from the novel teachings andadvantages of the present inventive concept. For example, the left-eyeobject may be deviated from the center of the left-eye image LI. In thiscase, the user may move the left-eye object in the first direction D1and the second direction D2 using the input device such that theleft-eye object can be disposed at the center of the left-eye image LI.When both of the left-eye object and the right-eye object are deviatedfrom the center of the left-eye image LI and the center of the right-eyeimage RI, the user may move the left-eye object and the right-eye objectin the first direction D1 and the second direction D2 using the inputdevice such that the left-eye object and the right-eye object can bedisposed at the center of the left-eye image LI and the right-eye imageRI.

The present inventive concept may be applied to an electronic devicehaving the display device. For example, the present inventive conceptmay be applied to a head mounted display, a smart phone, a smart pad forproviding VR (virtual reality) experience.

The foregoing is illustrative of example embodiments and is not to beconstrued as limiting thereof. Although a few example embodiments havebeen described, those skilled in the art will readily appreciate thatmany modifications are possible in the example embodiments withoutmaterially departing from the novel teachings and advantages of thepresent inventive concept. Accordingly, all such modifications areintended to be included within the scope of the present inventiveconcept as defined in the claims. Therefore, it is to be understood thatthe foregoing is illustrative of various example embodiments and is notto be construed as limited to the specific example embodimentsdisclosed, and that modifications to the disclosed example embodiments,as well as other example embodiments, are intended to be included withinthe scope of the appended claims.

What is claimed is:
 1. A method of driving a head mounted displaycomprising: deriving a position adjustment data by displaying abinocular position adjustment image on a left-eye panel region and aright-eye panel region; deriving a size adjustment data by displaying abinocular size adjustment image on the left-eye panel region and theright-eye panel region; generating a luminance adjustment data based ona difference between a left-eye luminance perception data and aright-eye luminance perception data; converting an image source into aninput image data based on at least one of the position adjustment data,the size adjustment data, or the luminance adjustment data; anddisplaying an image corresponding to the input image data on theleft-eye panel region and the right-eye panel region.
 2. The method ofclaim 1, further comprising: displaying a binocular balancing image onthe left-eye panel region and the right-eye panel region, wherein thebinocular balancing image includes a first left-eye image and a firstright-eye image, the first left-eye image including a fir left-eyeobject and displayed on the left-eye panel region, the first right-eyeimage including a first right-eye object and displayed on the right-eyepanel region.
 3. The method of claim 1, wherein the deriving theposition adjustment data includes: displaying a second left-eye imageincluding a second left-eye object on the left-eye panel region and asecond right-eye image including a second right-eye object on theright-eye panel region; moving at least one of the second left-eye imageor the second right-eye image in a first direction or a second directionorthogonal to the first direction based on an input signal received froman input device; and generating the position adjustment data based on amoved position to which the at least one of the second left-eye image orthe second right-eye image is moved.
 4. The method of claim 3, wherein afirst color of the second left-eye object is complementary to a secondcolor of the second right-eye object.
 5. The method of claim 3, whereinthe second left-eye object and the second right-eye object havedifferent sizes and have shapes substantially the same to each other. 6.The method of claim 3, wherein the second left-eye object and the secondright-eye object are symmetrical with each other and have the same size.7. The method of claim 3, wherein the second left-eye image furtherincludes a first guide object of which position does not changedregardless of the input signal, wherein the second right-eye imagefurther includes a second guide object of which position does notchanged regardless of the input signal, and wherein the first guideobject and the second guide object are disposed at positionscorresponding to each other.
 8. The method of claim 1, wherein thederiving the size adjustment data includes: displaying a third left-eyeimage including a third left-eye object on the left-eye panel region anda third right-eye image including a third right-eye object on theright-eye panel region; scaling at least one of the third left-eye imageor the third right-eye image in a first direction or in a seconddirection orthogonal to the first direction based on an input signalreceived from an input device; and generating the size adjustment databased on a scaled size to which the at least one of the third left-eyeimage or the third right-eye image is scaled.
 9. The method of claim 8,wherein the third left-eye object and the third right-eye object aresymmetrical with each other and have the same size.
 10. The method ofclaim 1, wherein the generating the luminance adjustment data includes:deriving the left-eye luminance perception data by displaying a left-eyeluminance perception image on the left-eye panel region, and derivingthe right-eye luminance perception data by displaying a right-eyeluminance perception image on the right-eye panel region, and whereinthe deriving the left-eye luminance perception data includes: displayinga fourth left-eye image including a fourth left-eye object on theleft-eye panel region and a fourth right-eye image on the right-eyepanel region; gradually increasing or decreasing a grayscale of thefourth left-eye object; and generating the left-eye luminance perceptiondata based on the grayscale of the fourth left-eye object at a timepoint when an input signal is received from an input device.
 11. Themethod of claim 10, wherein the fourth left-eye image includes abackground image having a first grayscale value, and wherein thegrayscale of the fourth left-eye object is increased or decreased everypredetermined period from the first grayscale value.
 12. The method ofclaim 10, wherein the fourth right-eye image includes a fourth right-eyeobject including a plurality of rectangular shapes having a plurality ofgrayscale values.
 13. The method of claim 10, wherein the deriving theright-eye luminance perception data includes: displaying a fifthleft-eye image on the left-eye panel region and a fifth right-eye imageincluding a fifth right-eye object on the right-eye panel region;gradually increasing or decreasing a grayscale of the fifth right-eyeobject; and generating the right-eye luminance perception data based onthe grayscale of the fifth right-eye object at a time point when theinput signal is received.
 14. The method of claim 1, wherein theconverting the image source into the input image data includes:adjusting a size of at least one of an input left-eye image or an inputright-eye image included in the image source based on the sizeadjustment data; adjusting a display starting point of at least one ofthe input left-eye image or the input right-eye image based on theposition adjustment data and the size adjustment data; and adjusting aluminance of at least one of the input left-eye image or the inputright-eye image based on the luminance adjustment data.
 15. A method ofdriving a head mounted display comprising: deriving a binoculardisparity adjustment data by displaying a binocular disparity adjustmentimage on a left-eye panel region and a right-eye panel region;generating an input image data by adjusting at least one of an inputleft-eye image displayed on the left-eye panel region or an inputright-eye image displayed on the right-eye panel region based on thebinocular disparity adjustment data; and displaying an imagecorresponding to the input image data on the left-eye panel region andthe right-eye panel region.
 16. The method of claim 15, wherein thebinocular disparity adjustment data includes at least one of a positionshift value, a size ratio, or a luminance ratio of a right-eye imagewith respect to a left-eye image.
 17. The method of claim 15, whereinderiving the binocular disparity adjustment data includes: displaying abinocular balancing image on the left-eye panel region and the right-eyepanel region; deriving a position adjustment data by displaying abinocular position adjustment image on the left-eye panel region and theright-eye panel region; deriving a size adjustment data by displaying abinocular size adjustment image on the left-eye panel region and theright-eye panel region; deriving a left-eye luminance perception data bydisplaying a left-eye luminance perception image on the left-eye panelregion; deriving a right-eye luminance perception data by displaying aright-eye luminance perception image on the right-eye panel region; andgenerating a luminance adjustment data based on a difference between theleft-eye luminance perception data and the right-eye luminanceperception data.
 18. A head mounted display comprising: a display deviceconfigured to display an image on a left-eye panel region and aright-eye panel region; and an image processor configured to derive abinocular disparity adjustment data by providing a binocular disparityadjustment image data to the display device, configured to generateinput image data by adjusting at least one of an input left-eye imagedata for the left-eye panel region or an input right-eye image data forthe right-eye panel region based on the binocular disparity adjustmentdata, and configured to provide the input image data to the displaydevice.
 19. The head mounted display of claim 18, wherein the binoculardisparity adjustment data includes at least one of a position shiftvalue, a size ratio, or a luminance ratio of a right-eye image withrespect to a left-eye image.
 20. The head mounted display of claim 18,wherein the image processor includes: an adjustment data determinerconfigured to determine the binocular disparity adjustment data based onuser information and driving information; and an input image generatorconfigured to receive image source and configured to generate the inputimage data by adjusting at least one of the input left-eye image data orthe input right-eye image data included in the image source based on thebinocular disparity adjustment data.